Anthropic switched to HTML artifacts because they deliver richer, more...

https://www.mikegingerich.com/blog/anthropic-adopts-html-over-markdown-for-workflows/

Anthropic switched to HTML artifacts because they deliver richer, more interactive docs for internal planning, code reviews, design systems, and reports. HTML cuts output costs to about $0.08 per document and loads five times faster than Markdown previews